stutz



2 Sheets-Sheet 1.

(No Model.)

S. ST UT Z. MINING MAGEINE.

2 Sheets-Sheet 2.

(No Model.)

` S. STUTZQ MINING MACIIINI'J". v No. 302,957. Patented Aug. 5, 1884.

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UNITED Srnrns @einer @erica SEBASTIAN STUTZ, OF' PITTSBURG, 'PENXSYLVAIA.

MINING-MACHINE.

dated August 5, 1884.

Application ilcd November 211, 158.3. (No model.)

To @ZZ whom il may concern.'

Be it known that I, Snnnsfrnln STUTZ, a citizen of the United States, residing at Pittsburg, county of Allegheny, State of Pennsylvania, have invented or discovered anew and useful Improvement in MiningMa-chines; and l do hereby declare the following to be a full, clear, concise, and exact description thereof, reference being had to the accompanying d rawings, making a part of this specieation, in which-like letters indicating like parts- Figure l, Sheet 1, is a side view in elevation of a mining-machine embodying my invention; Fig. 2, a plan or top view of the same; Fig. 3, a side view 4of apick-liolder of greater length than that shown in Figs. l and 2;'Fig. fi, Sheet 2, a vertical longitudinal central seetion, on an enlarged scale, through the cylinder, valve-chest, and guide; Fig. 5, a plan or top View of a portion of the cylinder and the guide; Fig. 6, a vertical transverse section through the guide and piston-redet the line 2 2 of Fig. 4; 7, asimilar section through the cylinder and valve-chest at the line-3 3 of Fig. 4, and Fig. S a similar section at the line 4 el of Fig. 4C. e

My present invention relates to coal and ore mining machines ofthe class in which a piek or cutting-tool is operated by a piston reciprocated in a cylinder by luidpressure, and is lan improvement upon that for which l have tiled an application for Letters Patent of the United States under date of September 10, 1883, Serial No. 106,057. j

My improvements are designed to attain inlcreased economy and effectiveness in the con struction and operation of the machine, and they consist in certai nnovel devices and combinations hereinafter set forth, including a cylinder, a main piston and rod Working therein,

a slide distribution-valve governing the supply and exhaust of said main piston, apair of diierential-valveoperatin g pistons connected by a hollow stein, an auxiliary exhaust-port extending from the valve-chest to the pistonrod guide, au exhaust-passage extending from one side of the main piston to a point in the periphery of the piston-rod, supplemental exhaust-ports located on the lower sidel of the cylinder, valves cr cocks for regulating the speed oi the distributionvalvc by controlling the suppl y or exhaust of its operatingpistons, a rear guide for steadying and preventing axial movement of the main piston and rod in the cylinder, and a handle connected to the rear cylinder-head for governing the position of the machine in operation.

In the practice of my invention the cylinder A is mounted and supported upon front an d rear bearing-Wheels,B and B', secured, respectively/,upon axles b and 1)',Which are fitted to rotate in bearings cast upon the lower side of the cylinder A.. The front wheels, B, are fitted concentrically with and the rear Wheels, B, eccentrically to their respective axles, and a pair of operatinghandles, B2, are iitted into recesses or sockets in the 'hubs of the rear Wheels said handles projecting rearwardly for a sufficient distance to be conveniently grasped by the operator when seated in position for governing the machine. The niain piston C, which its accurately the bore of the cylinder A, is formed upon or secured to a piston-rod, G', which passes through a properly-packed guide, A', projecting centrally from the front head oi' the cylinder. A removable pick-holder, l), secured by a key, d, or in any other proper manner,to the outer end of the piston-rod, carries a Jpick or cutting-tool, D, by the blows of which upon a `mass of coal or other mineral the undercutting, undermining, slotting, or excavation of the same is effected. The pickholder is so connected to the piston-rod that it may be 'readily removed and replaced or another substituted Whenever required, and in the operation ofthe machine several pick-holders of different lengths may be provided, that the machine may perform its Work when located at a greater or less distance from the material to be eut, as circumstances may require. In the instance illustrated the conncction'of the pick D' and piclnholder l) is effected by inserting a cylindrical shank on the rear end of the pick into a corresponding socket iu the front of the pickiholder, the latter being slotted at each side from said socket to its peri ph ery, as at d', and provided with clamping bolts d'2, by which it may be closed tightly on the pick. The latter will thus be firmly held, and may, by slackening the clamping-bolts,

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be turned in its socket, so as to vary the pcsition of its cutting edge as desired, as indicated by dotted lines in Fig. 3. The supply of motive fluid to and its exhaust from the cylinder A to impart reciprocating movement to the main piston C is effected by a slide distribution-valve, V, which is adapted to reciprocate on a valve-face on the upper side ofthe cylinder within a valve-chest, c, secured thereto, and to govern the opening and closure of supply and exhaust ports it" cr e therein.

In the proper operation of machines of the class to which my invention relates it is necessary that the movements of the distribution- Valve should be independent of those of the main piston, inasmuch as the length of stroke of the latter will Vary from time to time in correspondence with the constantly-varying distance between the working-face of the material to becutand the edge of the cutting tool or pick.. Themain piston in its movements always reaches the same point in the cylinder as the rearward extremity of its traverse, but may move in the opposite direction only a fraction of its greatest admitted stroke, when the piek will strike the material to be cut, and require that the distributionvalve shall open the supply-port at the forward end to move the piston back toits starting-point for striking another blow. Such independent operation of the distribution valve is effected by the construction now to be described. Two valve-operating pistons, p 1J', are formed on or secured to a hollow stem, s, fitted to reciprocate inthe valve-chest c, and having downwardly-projecting collars or flanges, which engage shoulders on the distribution-valve V, so as to effect movement of said valve coincidently with that of the stem and pistons. The'larger piston, p, fits accurately in a chamber, c, at the forward end of the valve-chest, from which chamber an auxiliary exhaust-port, governed by a cock or valve, 1', leads to the inner surface of the piston-rod guide A. Ports e2 lead from the internal passage of the stem s to the periphery thereof, and are closed when the stem is at and near the end of its traverse to the right by a socket in the right-hand end of the valve-chest, within which the stem fits. Operating-liuid is admitted to the valve-chest by a' cock or valve, I, governing side-nozzles, 2,

to either of which a supply-pipe may be connected, and the opening of the ports e2 for supply may be increased or diminished, as desired, by a cock, 7c. A lateral exhaust-port, a', formed in the main piston-rod C', communicateswith alongitudinal passage, a2, therein, said passage extending to and through the main piston C, and being enlarged for a portion of its length to receive a rear guide, E, the section of which is that of a Zone or other figure differing from a circle, and which is secured to the right-hand cylinder-head A2. Said guide, the purpose of which is to prevent axial rotation of the main piston, and rod and insure accurate longitudinal 4movement, passes thr\ough an opening of correspending section in a nut, E', screwed into the right-hand side of the main piston, and made fast therein by apin or key. Openings a3 in the nut E establish communication between the passage c2 and the cylinder A on the right-hand side of the main piston.

In lieu of employing a central rear guide of a section differing from a circle, as shown, a cylindrical rod set outside of the axial line of the cylinder may be employed, if preferred.

Referring to Fig. 4, the main piston C is shown as moving to the right, under the pressure of motive fluid which enters from the valvechest by the port t', and has reached a point in its traverse when the lateral port a of its rod C communicates with the auxiliary exhaust-port c, thus opening an outlet through the ports c, a, c2, c3, i', and c', which relieves pressure on the left side of the larger valveoperating piston, p. The preponderance of pressure in the valve-chest on the right side of the piston p, due to the excess of its diameter above that of the piston p,will then force said pistons and their stem s to the left, carrying with them the distribution-valve V, and thereby opening the inlet-port v2 to the cylinder. rlhis movement of the stem s brings the inlet-ports eAZ into communication with the valve-chest c, thus admitting motive fluid through the stem s to the left side of the larger piston p. Vhen the movement of the main piston closes exhaust through the auxiliary exhaust-port a, the exhaust of Afluid-pressure passing through the hollow stem sis prevented,

and a preponderanceof pressure is thereupon exerted on the left side of the valve-operati n g piston p, by which the valve-operating pistons and valve V are moved to the right, opening the left-hand supply port i, as in Fig. 4, for the next right-hand stroke of the main piston. It will thus be seen that the movements of the valve V effected by the operating-pistons p p are governed entirely by the fluid admitted to and exhausted from the left side of the piston p. The speed of the valve can be accurately regulated as required by increasing or diminishing the area of the supply or the exhaust passages, or both, by the cocks k and r.

For the purpose of quickly relieving the main piston C of pressure prior to the completion of its stroke in each direction, so as to prevent injurious shocks from its Contact with the cylinder-heads, I provide supplemental exhaust-openings c a5, which'are formed in the bore of the cylinder and [on the lower side thereof. -Said openings are located in such position that one of them shall be uncovered by the piston just prior to the termination of its stroke in each direction, and serve to quickly relieve the pressure upon the piston, as well as to drain from the cylinder any water which may find entrance thereto, as will be frequently the case, whether steam or compressed air be employed as the operatingfluid.

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In order to counteract the tendency of the blows of the pick to raise the rear end of the` machine when cutting upwardly, I provide a handle, Ii?, which is secured to the rear cylinder-head, A2, projecting therefrom, so as to be grasped by the operator with one or both hands. By means of said handle he can press downwardly to resist any tendency to upward movement of the machine, and can also use it in connection with one of the side handles, B2, for moving the machine laterally, to change the position of the pick relatively to the material to be cnt.

I claim herein as my. invention-n 1. The combination, substantially as set forth, of a distribution-valve working in a valve-chest and adapted to govern the supply and exhaust passages of a steam or air cylinder, a pair of differential pistons coupled to said valve, said pistons having their inner sides exposed continuously to the pressure in the valve-chest, and means for reciprocating said pistons and valve by alternateiy applying a preponderance of duid-pressure to the inner and to the outer sides, respectively, of the larger piston by the opening and closure of an auxiliary exhaust-passage leading therefrom.

2. The' combination, lsubstantially as `set forth,of a valve-chest, a distribution-valve, a pair of differential valve-operating pistons fixed on a hollow stern which is coupled to said valve, a supply-port in said stem, through which fluid-pressure from the chest may be exerted upon the outer side of the larger piston, and an auxiliary exhaust-port for releasing pressure upon the outer side of said pis- Lio 3. The combination, substantiallyl as set forth, of a distribution-valve adapted to govern the supply and exhaust passage of a steam or air cylinder, a pair of diiferential pistons coupled to said valve, a supply `port and passage adapted to conduct motive fluid to the outer side of the larger valve-operating pisdifferential valve-operating pistons secured to a hollou7 stem which is coupled to said distribution-valve, a port in said stein adapted to alternately open and close communication between its bore andthe valve-chest, a chamber fitting the larger valve-operating piston, an auxiliary exhaust port connecting said chamber with a guide or casing inclosing the main piston-rod, and an exhaust-passage extending from a point in the periphery of said rod to the opposite side of the :main piston.

5. The combination, substantially as sot forth, of a cylinder, a piston and rod working therein, and a guide bar or rod connected to the rear head of the cylinder and entering a longitudinal opening or socket in the piston and rod, said guide acting to prevent axial rotation of said piston and rod and insure accurate lon gitudinal movements thereof.

6. The combination, substantially as set forth, of acylinder, a piston and rod working therein, a rear guide having a section which is different from a circle, a nut or cap having a similarly-formed opening and secured to the piston,and one or more side openings or passages, and an exhaust-passage of great-er sectional area than that of the guide, said passage being formed in the piston-rod and coinmunicating with the side passage or passages of the nut or cap in the piston.

7. The combination, substantially as set forth, of a cylinder, a piston and rod adapted to reciprocate therein, a distribution-valve governing main supply and exhaust passages in the cylinder, and a supplemental exhaustpassage leading from the bore of the cylinder to the atmosphere on the lower side of the cylinder.

8. In a mining-machine, the combination, substantially as set forth, of a cylinder, a piston and 'rod working therein and adapted to reciprocate a pick or cutting-tool, wheels supporting the cylinder, one or more side operating-handles extending rearwardly therefrom, and an operating-handle connected to the rear head thereof.

In testimony whereof I have hereunto set my hand.

SEBASTIAN STUTZ.

TWitnesses:

J. SNOWDEN BELL, It. II. -V-Ii'rrrnsnr.

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